Turn off your TV, video player, stereo and computer when you aren't using them. Turn off your lights when you don't need them and you start saving within a minute or two. You can prevent energy losses by plugging electronic devices into a power strip and turning the power strip off when the devices are not in use. The largest source of greenhouse gases is electric power generation. The average home actually contributes more to global warming than the average car. This is because much of the energy we use in our homes comes from power plants which burn fossil fuel to power our electric products.